In our opinions, we examined how agencies were implementing certain provisions to which the President objected in the signing statements. In developing our first opinion, we examined all the signing statements accompanying the fiscal year 2006 appropriations acts, identified 160 specific provisions of law to which the President objected, and categorized each provision according to the nature of the President’s stated concern. The President’s objections to a majority of provisions fell under broad categories, four of which we summarize in the testimony: President’s theory of the unitary executive, President’s constitutional role, INS v. Chadha, and Fifth Amendment.

We then chose 19 provisions to learn whether the agencies were executing the provisions as written. In considering which provisions would be appropriate for further inquiry, we excluded provisions for which it would be difficult to determine whether the President was executing the provision, either because of the breadth of the executive action covered or because the information would not be readily available due to national security or foreign relations concerns. GAO also looked at 10 other provisions from various laws identified by congressional requestors to which the President objected in order to ascertain how agencies were executing the provisions.

In total, GAO examined how 21 agencies executed 29 different provisions of law. GAO determined that in all but 9 cases the agencies had either taken actions to execute the provisions as written, or conditions requiring agency action had not occurred. In the remaining 9 cases, GAO found that the agencies had not executed the provisions as written. We did not assess the merits of the President’s objections or examine the constitutionality of the provisions to which the President objected. Although we found that agencies did not execute 9 provisions as written, we could not conclude that agency noncompliance was the result of the President’s signing statements. We also examined the extent to which federal courts have relied on signing statements in their interpretation of federal statutes. GAO found that only in rare instances have courts treated presidential signing statements as authoritative sources of statutory interpretation.

While GAO’s prior work did not involve any provisions in the recently enacted National Defense Authorization Act (NDAA) for fiscal year 2008, three provisions in the NDAA to which the President objected are similar to provisions we examined in our earlier opinions. We found that agencies had not executed two of these earlier provisions as written.

To reduce any effect signing statements may have on agency execution of statutes, Congress may wish to focus its oversight work to include those provisions to which the President objects to ensure that the laws are carried out.

Read full report here.